If this message appeared after new tires, a wheel swap, or tire service, note what work was done. The system may need a relearn, but the message alone cannot confirm that. Here’s how to check pressure and narrow down the fault.
What does “Service Tire Monitor System” mean?
This message means the vehicle has detected a fault in the tire pressure monitoring system, or TPMS. The system may not be able to monitor tire pressure or warn you reliably. The message does not identify which part has failed.
The wording is common on some GM vehicles, including Chevrolet and Buick, but other makes may show a different message. A low-pressure warning and a TPMS system fault are separate alerts, though both can appear at the same time. Check your vehicle’s manual for what its warning lights and messages mean.
A tire can also be underinflated while the TPMS has a fault. Use a pressure gauge rather than relying on the dashboard display when this message is present.
Common causes of the warning
A TPMS sensor is not communicating
In a direct TPMS, a sensor in each monitored wheel sends pressure information to the vehicle. A sensor may stop transmitting because it is damaged or its internal battery has failed. The battery is typically sealed inside the sensor, so the sensor assembly is replaced. See our guide to tire pressure sensor symptoms.
A sensor was damaged during tire or wheel service
Some TPMS sensors can be damaged while a tire is removed or installed. If the message appeared right after tire work, tell the shop what was done and ask them to check sensor communication before replacing parts.
The system needs a sensor relearn
Some vehicles need the tire positions or sensor IDs relearned after a sensor, wheel, or tire change. The required procedure depends on the vehicle. A relearn is not automatically needed after every tire rotation or pressure adjustment, so follow the instructions for your exact model.
Some procedures require a TPMS-compatible activation or scan tool. A basic engine-code reader may not communicate with the TPMS module or perform a sensor relearn.
There is a fault in the TPMS wiring or control system
Damaged wiring, a communication problem, or a fault in another TPMS component can also trigger the message. A scan tool can help identify the affected circuit or condition, but testing is needed to confirm the cause. Do not replace sensors or a control module based only on the dashboard message.
What to do when the message appears
- Check the tires manually. Measure each tire’s pressure and look for visible damage or a leak.
- Correct low pressure. Inflate the tires to the vehicle’s specified pressure. Do not drive on a flat, damaged, or rapidly leaking tire.
- Note the warning-light pattern. Some vehicles flash the TPMS light before it stays on when a system fault is detected. Check your owner’s manual for your vehicle’s warning pattern.
- Arrange a TPMS scan. Use a tool that can access the TPMS module, or ask a tire shop or repair shop to scan it.
- Repair the confirmed fault. If the warning appeared after tire or wheel service, ask the shop to check sensor communication and complete the correct relearn if required.
- Verify the repair. Confirm the warning clears and the system reports pressure as expected for your vehicle.
Do not try to fix the message by disconnecting the battery or repeatedly resetting the system. A reset will not repair a sensor or wiring fault. For more information, see what the tire pressure light means and how to reset the TPMS when your vehicle’s procedure calls for it.
Can you drive with the message on?
Check tire pressure before driving far because the TPMS may not warn you reliably while the fault is present. If all tires are at the specified pressure and none is damaged or losing air, you can generally drive cautiously to a repair shop. If a tire is significantly low, flat, or visibly damaged, do not continue driving on it.
How much does it cost to fix?
If the fault is a TPMS sensor, replacement averages about $240 to $299 in the United States. The actual cost depends on the vehicle, location, and repair needed. That estimate does not cover every possible TPMS fault. See RepairPal’s sensor replacement estimate for details.
Frequently asked questions
Is “Service Tire Monitor System” the same as low tire pressure?
No. The service message generally indicates a TPMS fault, while a low-pressure warning means the system has detected low pressure. A tire can still be underinflated when a system fault is present, so check each tire manually.
Will the message go away after I add air?
Adding air may clear a low-pressure warning once the pressure is correct and the system updates. It will not repair a TPMS fault. If the service message remains, scan the TPMS and follow the vehicle-specific diagnostic procedure.
Can a weak car battery cause this message?
Do not assume the vehicle’s 12-volt battery caused the warning. Check tire pressure and scan the TPMS for codes before replacing a battery or sensor.
